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noun o, sonnnonn, or nocnrnsvnihs, unw JnnsnY, nssinnon or GEE-f run urnn irrnrrr hhifiilis unit-i To RUSSELL n rniini inn, or JENKINTOWN, PENNSYLVANIA.

ornnirniu nun cocoons or nanunco Tris onion.

fimhtilfllrffllmhiiorming pari. of narrow Pntcnrii o. 833.31%, ointei iloccmbor 29, Mimi Appllcnllon flied June 4, 188-5. Serial No. 531i, 851; (No npq cim'ens.)

Toull whom it may concern.-

l Be it known that I, J'onn i). Scnunnnra, of

McCainsville, in the county. of Morris and rate of New Jersey, have in /cnicri certain non and. useful Improvements in Eriplosive Compounds and in the Manufacturetherzifi; and I do hereby declare that tho following Specification is a clear, true, and complete do scrintion of imy invention.

My invention involves the use of nitroglycerinc; and my obiect is to produce a drygrnined free-running powder containing small but efi'cctivc proportions of uitroglyccrine.

'Thc'mnin feature of my invention is based upous discovery mode by ine that better rcooltscon be obtnined with low-grade powders if only a portion of the granular bone or (iopc be heavily charged with nitro-glyccrinc cud employed in ivurlous proportions with on charged. combustiblc nod ga ncoming ginnulor mutter than if the entire mass of groom lar mutter were chm-god with the some quaniity of nitroglycerine. In both cases tho pcr centoge of nitro-glyccrinc woulribe the some; but in the one case the liquid. explosive will be massed in n lli ghly'cifctivo quantity in each oi the churged grains, nod in the other case it will be so distributed in oil the grains. us to greatly impair its rictonuting cnpncity.

Broadly stated; the main i'cnturc of my in vcntion consists in charging absorbent grains or granules, whether combnstibieor noncombnstilolc, with a percentage of uitro-giycerinc highcr than is employed in low'grnoc high explosives, and thcn mixing suiri charged grains with uncharged; dry oombusr-ibic grnins in such proportion no will so for rcnucc ihc percentage of nitro-glyceriuo in tho unto cnusc the resulting cornponnfi to ho a air o grained low-grade high cxplosivc of such poi ticulnr cfiiciency nsinny be desired; in comic It will loo obvious thnt povrrl. colnpcs'cci oi charged grains compounded or miucol' with dry uncharged grnins must of ncccsniitgr poo As to-the grains orgranules which are to be charged with niiro-glyccrinc, it is to bc understood that they can bc widely varicri in pnrtu re frominy invention. As hereinbciorc siziterl, they may be cithcr non-combustible: or combustible; but the latter is obviously pref crnble; Sniri grains must also be capable of taking up and housing;

nitro-glycei'i ten per cent., sixty or seventy-five per ccnih, should be course, than would be screened by n twelve-mosh sieve.

'As a suitable non combusiibiegrain or grunulc to be thus charged infusoriol earth is cmployoll, in which case it is prepared as hero toi'ore for use in (lynamitcs by baking: it in cnlres; but instead of grinding it, as herctm fore, it is granulated and screened by me. finch grains should be charged with as high as, soy, sixty to seventy'fivc per cent. of nitro-glyccrino.

The combustible grains to be thus chargcri cnn be of various kinds and variously formed; and compounded without departure from my invention-was, for inst-once, such as are composed of a nitrate, sulphur, and carbonaceous matter. I prefer to use a novel dope inventor? by me, and which constitutcsthe subject of as separate npplication for Letters Patent. This grained dope is composed of nitrate of soon, carbonaceous or Woody matter, and sulphur,

no, sciiiom if over less tbcn, any, and iron i that to as high as, soy,

co, the sulphur being thereby melted, and in, such proportions that it constitutes whcn colri n ccllulur housing for the other ingrcriientc in ouch grain, and such grains are ccpnblo of for instance, by

, withoui impniring its pcrmcability.

Enid grcino and seldom, if over, srnnllcr anti their-character and! composition without ric- 55 cfi'ective qucntities of 6c these ingredients being compounded and host- 8 5 nhsorbing nod. fully housing from ten to forty 90 n wet proccssmpecicl 9 3;

producing grains oi" 2 season As to the dry grains with which said charged grains are to be mixed in vaccordance with my invention it is to he understood that they may also be widely varied without departure from 5. my invention. Said dry grains to be within myinvention must, however, be combustible. Said grains should be coarse and seldom, if

ever, finer than wouid be screened bya twelvemesh sieve, and it is immaterial whether they x are absorbent or noirabsorbcnt of the liquid combustible grains with five pounds of nitro-- -g'lycerine, and then mix the same with ninetythree and onethird pounds of dry combustible grains. In this case the grains should notibe unduly large, so that'they can be of greater number, and consequently well distributed throughoutthe mass. if deem 5o itimpracticableto use noncombustible grains charged with less than, on sixty per cent. of the liquid explosive; but with my novel dope froiny'saygteu to forty per cent. of nit-r0 glycerin can be employed. In preparing another variety of my novel five per cent. powder composed of said novel dopechurged with, say, twenty-five per cent. J {of nitro-glycerine, I take fifteen pounds of said dopecharged with five pounds of the liquid 40 explosive and mix thesame with eighty pounds of the some dry dope. 4

The wet-process grains specially prepared with reference to their absorbent capacity, as hereinbefore descritied, can be relied upon for n5 holding the nitro-glycerindin substantially non-combustible similar proportions as my novel dope, and therefore those grains charged with the liquid explosive should be used substantially as described in conned m l1 with said novel'dope.

, It will be seen that the percentage of liquid 59 explosive in the charged grains, and that the proportions of charged grains to uncharged grai us may be almost indefinitely varied without departure from my invention, and also that the dry grains may or may not have been specially prepared for my purposes-as, for instance, if the dry grains were. common black powder, I obtain a very efiicient and desirable five-per cent. nitro-glycerine powder by charging forty-five pounds of my novel dope with 60 five pounds of the liquid explosive and mixing the same with fifty pouudsof the common black powder.

Although I have specially referred to fiveper cent. powders, grades will only involve obvious changes in proportions of the charged and uncharged grains employed, governedby the proportions of the liquid explosive housed within the.

charged grains. 7o

Having thus described my 1' nveution, I claim as new and desire to secure by Letters Patent .1. The process of manufacturing dry-grained freerunning high-explosive compounds, substantially as hereinbefore described, the same consisting, first, in charging absorbent grauular matter with nitro-glycerine; and, secondly, in mixing said charged granules with dry com bustible grains or granules in quantity sufficieut to so far reduce the percent-age of nitro- 8o glycerine in the mass as to produce a low-grade powder, as set forth.

2. The low-grade dry-grained free-running powder, composed of absorbent grains charged with nitrogiyceriue and dry combustiblc-uucharged grains, substantially as described.

JOHN G. SCHRADER. Witnesses:

Jss. H. Nnronnoun', FRANK F. HUMMEL.

it is obviousth at higher 65 

